这类机械装置允许其工作对象的尺寸、位置在一定的范围内变化，它适应的对象主要是指外部对象。
This kind of mechanical device allows its workpiece's size and position varied in certain range, and what they study are external object.
这类机械装置允许其工作对象的尺寸、位置在一定的范围内变化，它适应的对象主要是指外部对象。
This kind of mechanical device allows its workpiece's size and position varied in certain range, and what they study are external object.
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